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	Changes in TIFF v4.0.9
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<B><FONT SIZE=+3>T</FONT>IFF <FONT SIZE=+2>C</FONT>HANGE <FONT SIZE=+2>I</FONT>NFORMATION</B>
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<B>Current Version</B>: v4.0.9<BR>
<B>Previous Version</B>: <A HREF=v4.0.8.html>v4.0.8</a><BR>
<B>Master FTP Site</B>: <A HREF="ftp://download.osgeo.org/libtiff">
download.osgeo.org</a>, directory pub/libtiff</A><BR>
<B>Master HTTP Site #1</B>: <A HREF="http://www.simplesystems.org/libtiff/">
http://www.simplesystems.org/libtiff/</a><BR>
<B>Master HTTP Site #2</B>: <A HREF="http://libtiff.maptools.org/">
http://libtiff.maptools.org/</a> 
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<P>
This document describes the changes made to the software between the
<I>previous</I> and <I>current</I> versions (see above).  If you don't
find something listed here, then it was not done in this timeframe, or
it was not considered important enough to be mentioned.  The following
information is located here:
<UL>
<LI><A HREF="#highlights">Major Changes</A>
<LI><A HREF="#configure">Changes in the software configuration</A>
<LI><A HREF="#libtiff">Changes in libtiff</A>
<LI><A HREF="#tools">Changes in the tools</A>
<LI><A HREF="#contrib">Changes in the contrib area</A>
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<A NAME="highlights"><B><FONT SIZE=+3>M</FONT>AJOR CHANGES:</B></A>

<UL>

	<LI> None

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<A NAME="configure"><B><FONT SIZE=+3>C</FONT>HANGES IN THE SOFTWARE CONFIGURATION:</B></A>

<UL>

  <LI> test/Makefile.am: Add some tests for tiff2bw.
  <LI> * .appveyor.yml, .travis.yml, build/travis-ci: apply patches
	0001-ci-Travis-script-improvements.patch and
	0002-ci-Invoke-helper-script-via-shell.patch by Roger Leigh
	(sent to mailing list)
  <LI> .travis.yml, build/travis-ci: new files from
	0001-ci-Add-Travis-support-for-Linux-builds-with-Autoconf.patch by
	Roger Leigh (sent to mailing list on 2017-06-08)
	This patch adds support for the Travis-CI service.
  <LI> .appveyor.yml: new file from
	0002-ci-Add-AppVeyor-support.patch by Roger Leigh (sent to mailing
	list on 2017-06-08)
	This patch adds a .appveyor.yml file to the top-level.  This allows
	one to opt in to having a branch built on Windows with Cygwin,
	MinGW and MSVC automatically when a branch is pushed to GitHub,
	GitLab, BitBucket or any other supported git hosting service.
  <LI> CMakeLists.txt, test/CMakeLists.txt, test/TiffTestCommon.cmake: apply
	patch 0001-cmake-Improve-Cygwin-and-MingGW-test-support.patch from Roger
	Leigh (sent to mailing list on 2017-06-08)
	This patch makes the CMake build system support running the tests
	with MinGW or Cygwin.

  <LI> test/tiffcp-lzw-compat.sh, test/images/quad-lzw-compat.tiff: new files
	to test old-style LZW decompression
  <LI> test/common.sh, Makefile.am, CMakeList.txt: updated with above
  <LI> test/Makefile.am: add missing reference to images/quad-lzw-compat.tiff
	to fix "make distcheck". Patch by Roger Leigh
  <LI> nmake.opt: support a DEBUG=1 option, so as to adjust OPTFLAGS and use
	/MDd runtime in debug mode.


</UL>

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<A NAME="libtiff"><B><FONT SIZE=+3>C</FONT>HANGES IN LIBTIFF:</B></A>

<UL>

    <LI> libtiff/tif_color.c: TIFFYCbCrToRGBInit(): stricter clamping to avoid
	int32 overflow in TIFFYCbCrtoRGB().
	Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1844
	Credit to OSS Fuzz

    <LI> libtiff/tif_getimage.c: initYCbCrConversion(): stricter validation for
	refBlackWhite coefficients values. To avoid invalid float->int32 conversion
	(when refBlackWhite[0] == 2147483648.f)
	Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1907
	Credit to OSS Fuzz

    <LI> libtiff/tif_dirinfo.c, tif_dirread.c: add _TIFFCheckFieldIsValidForCodec(),
	and use it in TIFFReadDirectory() so as to ignore fields whose tag is a
	codec-specified tag but this codec is not enabled. This avoids TIFFGetField()
	to behave differently depending on whether the codec is enabled or not, and
	thus can avoid stack based buffer overflows in a number of TIFF utilities
	such as tiffsplit, tiffcmp, thumbnail, etc.
	Patch derived from 0063-Handle-properly-CODEC-specific-tags.patch
	(http://bugzilla.maptools.org/show_bug.cgi?id=2580) by Raphaël Hertzog.
	Fixes:
	http://bugzilla.maptools.org/show_bug.cgi?id=2580
	http://bugzilla.maptools.org/show_bug.cgi?id=2693
	http://bugzilla.maptools.org/show_bug.cgi?id=2625 (CVE-2016-10095)
	http://bugzilla.maptools.org/show_bug.cgi?id=2564 (CVE-2015-7554)
	http://bugzilla.maptools.org/show_bug.cgi?id=2561 (CVE-2016-5318)
	http://bugzilla.maptools.org/show_bug.cgi?id=2499 (CVE-2014-8128)
	http://bugzilla.maptools.org/show_bug.cgi?id=2441
	http://bugzilla.maptools.org/show_bug.cgi?id=2433

    <LI> libtiff/tif_swab.c: if DISABLE_CHECK_TIFFSWABMACROS is defined, do not do
	the #ifdef TIFFSwabXXX checks. Make it easier for GDAL to rename the symbols
	of its internal libtiff copy.


    <LI> libtiff/tif_dirread.c: fix regression of libtiff 4.0.8 in
	ChopUpSingleUncompressedStrip() regarding update of newly single-strip
	uncompressed files whose bytecount is 0. Before the change of 2016-12-03,
	the condition bytecount==0 used to trigger an early exit/disabling of
	strip chop. Re-introduce that in update mode. Otherwise this cause
	later incorrect setting for the value of StripByCounts/StripOffsets.
	( https://trac.osgeo.org/gdal/ticket/6924 )
    <LI> libtiff/tif_dirread.c: TIFFFetchStripThing(): limit the number of items
	read in StripOffsets/StripByteCounts tags to the number of strips to avoid
	excessive memory allocation.
	Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2215
	Credit to OSS Fuzz
    <LI> libtiff/tif_getimage.c: avoid many (harmless) unsigned int overflows.
    <LI> libtiff/tif_fax3.c: avoid unsigned int overflow in Fax3Encode2DRow(). Could
	potentially be a bug with huge rows.
    <LI> libtiff/tif_jpeg.c: avoid (harmless) unsigned int overflow on tiled images.
    <LI> libtiff/tif_dirread.c: avoid unsigned int overflow in EstimateStripByteCounts()
	and BYTECOUNTLOOKSBAD when file is too short.
    <LI> libtiff/tif_predict.c: decorate legitimate functions where unsigned int
	overflow occur with TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW
	* libtiff/tif_dirread.c: avoid unsigned int overflow in EstimateStripByteCounts()
    <LI> libtiff/tiffiop.h: add TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW macro to
	disable CLang warnings raised by -fsanitize=undefined,unsigned-integer-overflow
    <LI> libtiff/tif_jpeg.c: add anti-denial of service measure to avoid excessive
	CPU consumption on progressive JPEGs with a huge number of scans.
	See http://www.libjpeg-turbo.org/pmwiki/uploads/About/TwoIssueswiththeJPEGStandard.pdf
	Note: only affects libtiff since 2014-12-29 where support of non-baseline JPEG
	was added.

    <LI> libtiff/tif_jpeg.c: error out at decoding time if anticipated libjpeg
	memory allocation is above 100 MB. libjpeg in case of multiple scans,
	which is allowed even in baseline JPEG, if components are spread over several
	scans and not interleavedin a single one, needs to allocate memory (or
	backing store) for the whole strip/tile.
	See http://www.libjpeg-turbo.org/pmwiki/uploads/About/TwoIssueswiththeJPEGStandard.pdf
	This limitation may be overriden by setting the 
	LIBTIFF_ALLOW_LARGE_LIBJPEG_MEM_ALLOC environment variable, or recompiling
	libtiff with a custom value of TIFF_LIBJPEG_LARGEST_MEM_ALLOC macro.
    <LI> libtiff/tif_jbig.c: fix memory leak in error code path of JBIGDecode()
	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2706
	Reported by team OWL337
    <LI> libtiff/tif_dirread.c: in TIFFReadDirEntryFloat(), check that a
	double value can fit in a float before casting. Patch by Nicolas RUFF
    <LI> libtiff/tiffiop.h, libtiff/tif_jpeg.c, libtiff/tif_jpeg_12.c,
	libtiff/tif_read.c: make TIFFReadScanline() works in
	CHUNKY_STRIP_READ_SUPPORT mode with JPEG stream with multiple scans.
	Also make configurable through a LIBTIFF_JPEG_MAX_ALLOWED_SCAN_NUMBER
	environment variable the maximum number of scans allowed. Defaults to
	100.
    <LI> libtiff/tif_read.c: TIFFFillTile(): add limitation to the number
	of bytes read in case td_stripbytecount[strip] is bigger than
	reasonable, so as to avoid excessive memory allocation (similarly to
	what was done for TIFFFileStrip() on 2017-05-10)
    <LI> libtiff/tif_getimage.c: use _TIFFReadEncodedStripAndAllocBuffer(). 
	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2708 and
	https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2433 .
	Credit to OSS Fuzz
    <LI> libtiff/tif_read.c, tiffiop.h: add a _TIFFReadEncodedStripAndAllocBuffer()
	function, variant of TIFFReadEncodedStrip() that allocates the
	decoded buffer only after a first successful TIFFFillStrip(). This avoids
	excessive memory allocation on corrupted files.
    <LI> libtiff/tif_dirwrite.c: in TIFFWriteDirectoryTagCheckedXXXX()
	functions associated with LONG8/SLONG8 data type, replace assertion that
	the file is BigTIFF, by a non-fatal error.
	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2712
	Reported by team OWL337
    <LI> libtiff/tif_read.c: TIFFStartTile(): set tif_rawcc to
	tif_rawdataloaded when it is set. Similarly to TIFFStartStrip().
	This issue was revealed by the change of 2017-06-30 in TIFFFileTile(),
	limiting the number of bytes read. But it could probably have been hit
	too in CHUNKY_STRIP_READ_SUPPORT mode previously ?
	Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2454
	Credit to OSS Fuzz
    <LI> libtiff/tif_error.c, tif_warning.c: correctly use va_list when both
	an old-style and new-style warning/error handlers are installed.
	Patch by Paavo Helde (sent on the mailing list)
    <LI> libtiff/tif_getimage.c: use _TIFFReadTileAndAllocBuffer().
	Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2470
	Credit to OSS Fuzz.
    <LI> libtiff/tif_read.c, tiffiop.h: add a _TIFFReadEncodedTileAndAllocBuffer()
	and _TIFFReadTileAndAllocBuffer() variants of TIFFReadEncodedTile() and
	TIFFReadTile() that allocates the decoded buffer only after a first
	successful TIFFFillTile(). This avoids excessive memory allocation
	on corrupted files.
    <LI> libtiff/tif_pixarlog.c: avoid excessive memory allocation on decoding
	when RowsPerStrip tag is not defined (and thus td_rowsperstrip == UINT_MAX)
	Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2554
	Credit to OSS Fuzz
    <LI> libtiff/tif_lzw.c: fix 4.0.8 regression in the decoding of old-style LZW
	compressed files.
    <LI> libtiff/tif_lzw.c: fix potential out-of-buffer read on 1-byte LZW
	strips. Crashing issue only on memory mapped files, where the strip
	offset is the last byte of the file, and the file size is a multiple
	of one page size on the CPU architecture (typically 4096). Credit
	to myself :-)
    <LI> libtiff/tif_dir.c: avoid potential null pointer dereference in
	_TIFFVGetField() on corrupted TIFFTAG_NUMBEROFINKS tag instance.
	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2713
    <LI> tools/tiff2pdf.c: prevent heap buffer overflow write in "Raw"
	mode on PlanarConfig=Contig input images.
	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2715
	Reported by team OWL337
    <LI> libtiff/tif_read.c: TIFFFillStrip() / TIFFFillTile().
	Complementary fix for http://bugzilla.maptools.org/show_bug.cgi?id=2708
	in the isMapped() case, so as to avoid excessive memory allocation
	when we need a temporary buffer but the file is truncated.
    <LI> libtiff/tif_read.c: TIFFFillStrip() / TIFFFillTile().
	Complementary fix for http://bugzilla.maptools.org/show_bug.cgi?id=2708
	in the isMapped() case, so as to avoid excessive memory allocation
	when we need a temporary buffer but the file is truncated.
    <LI> libtiff/tif_read.c: in TIFFFetchStripThing(), only grow the
	arrays that hold StripOffsets/StripByteCounts, when they are smaller
	than the expected number of striles, up to 1 million striles, and
	error out beyond. Can be tweaked by setting the environment variable
	LIBTIFF_STRILE_ARRAY_MAX_RESIZE_COUNT.
	This partially goes against a change added on 2002-12-17 to accept
	those arrays of wrong sizes, but is needed to avoid denial of services.
	Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2350
	Credit to OSS Fuzz
    <LI> libtiff/tif_read.c: in TIFFFetchStripThing(), only grow the
	arrays that hold StripOffsets/StripByteCounts, when they are smaller
	than the expected number of striles, up to 1 million striles, and
	error out beyond. Can be tweaked by setting the environment variable
	LIBTIFF_STRILE_ARRAY_MAX_RESIZE_COUNT.
	This partially goes against a change added on 2002-12-17 to accept
	those arrays of wrong sizes, but is needed to avoid denial of services.
	Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2350
	Credit to OSS Fuzz
    <LI> libtiff/tif_read.c: add protection against excessive memory
	allocation attempts in TIFFReadDirEntryArray() on short files.
	Effective for mmap'ed case. And non-mmap'ed case, but restricted
	to 64bit builds.
	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2675
    <LI> libtiff/tif_read.c: add protection against excessive memory
	allocation attempts in TIFFReadDirEntryArray() on short files.
	Effective for mmap'ed case. And non-mmap'ed case, but restricted
	to 64bit builds.
	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2675
   <LI> libtiff/tif_luv.c: LogLuvInitState(): avoid excessive memory
	allocation when RowsPerStrip tag is missing.
	Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2683
	Credit to OSS-Fuzz
   <LI> libtiff/tif_getimage.c: gtTileContig() and gtTileSeparate():
	properly break from loops on error when stoponerr is set, instead
	of going on iterating on row based loop.
   <LI> libtiff/tif_getimage.c: fix fromskew computation when to-be-skipped
	pixel number is not a multiple of the horizontal subsampling, and
	also in some other cases. Impact putcontig8bitYCbCr44tile,
	putcontig8bitYCbCr42tile, putcontig8bitYCbCr41tile,
	putcontig8bitYCbCr21tile and putcontig8bitYCbCr12tile
	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2637 (discovered
	by Agostino Sarubbo)
	and https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2691 (credit
	to OSS Fuzz)
   <LI> libtiff/tif_luv.c: further reduce memory requirements for temporary
	buffer when RowsPerStrip >= image_length in LogLuvInitState() and
	LogL16InitState().
	Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2700
	Credit to OSS Fuzz
   <LI> libtiff/tif_dirwrite.c: replace assertion related to not finding the
	SubIFD tag by runtime check (in TIFFWriteDirectorySec())
	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2727
	Reported by team OWL337
   <LI> libtiff/tif_dirwrite.c: replace assertion to tag value not fitting
	on uint32 when selecting the value of SubIFD tag by runtime check
	(in TIFFWriteDirectoryTagSubifd()).
	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2728
	Reported by team OWL337
   <LI> libtiff/tif_jpeg.c: accept reading the last strip of a JPEG compressed
	file if the codestream height is larger than the truncated height of the
	strip. Emit a warning in this situation since this is non compliant.
   <LI> libtiff/tiffiop.h, tif_aux.c: redirect SeekOK() macro to a _TIFFSeekoK()
	function that checks if the offset is not bigger than INT64_MAX, so as
	to avoid a -1 error return code of TIFFSeekFile() to match a required
	seek to UINT64_MAX/-1.
	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2726
	Adapted from proposal by Nicolas Ruff.
   <LI> libtiff/tif_dirread.c: add NULL check to avoid likely false positive
	null-pointer dereference warning by CLang Static Analyzer.
   <LI> libtiff/libtiff.def: add TIFFReadRGBAStripExt and TIFFReadRGBATileExt
	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2735
   <LI> libtiff/tif_jpeg.c: add compatibility with libjpeg-turbo 1.5.2 that
	honours max_memory_to_use > 0.
	Cf https://github.com/libjpeg-turbo/libjpeg-turbo/issues/162
   <LI> libtiff/tif_getimage.c: avoid floating point division by zero in
	initCIELabConversion()
	Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=3733
	Credit to OSS Fuzz
</UL>

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<A NAME="tools"><B><FONT SIZE=+3>C</FONT>HANGES IN THE TOOLS:</B></A>

<UL>

    <LI> tools/tiff2pdf.c: prevent heap buffer overflow write in "Raw"
	mode on PlanarConfig=Contig input images.
	Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2715
	Reported by team OWL337
    <LI> tools/tiffset.c: fix setting a single value for the ExtraSamples tag
	(and other tags with variable number of values).
	So 'tiffset -s ExtraSamples 1 X'. This only worked
	when setting 2 or more values, but not just one.
    <LI> tools/fax2tiff.c (_FAX_Client_Data): Pass FAX_Client_Data as the
	client data.  This client data is not used at all at the moment,
	but it makes the most sense.  Issue that the value of
	client_data.fd was passed where a pointer is expected was reported
	via email by Gerald Schade on Sun, 29 Oct 2017.
    <LI> tools/tiff2pdf.c (t2p_sample_realize_palette): Fix possible
	arithmetic overflow in bounds checking code and eliminate
	comparison between signed and unsigned type.
    <LI> tools/tiff2bw.c (main): Free memory allocated in the tiff2bw
	program.  This is in response to the report associated with
	CVE-2017-16232 but does not solve the extremely high memory usage
	with the associated POC file.

</UL>

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<A NAME="contrib"><B><FONT SIZE=+3>C</FONT>HANGES IN THE CONTRIB AREA:</B></A>

<UL> 

  <LI> None

</UL>

Last updated $Date: 2017-11-18 19:38:06 $.

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